[PATCH net] ipv6: release dst on error in ip6_dst_lookup_tail

[Willem de Bruijn]

From: Willem de Bruijn <will...@google.com>

If ip6_dst_lookup_tail has acquired a dst and fails the IPv4-mapped
check, release the dst before returning an error.

Fixes: b2e6f0c8dde5 ("ipv6: Inhibit IPv4-mapped src address on the wire.")
Signed-off-by: Willem de Bruijn <will...@google.com>
---
 net/ipv6/ip6_output.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e164684456df..7cebee58e55b 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1022,8 +1022,10 @@ static int ip6_dst_lookup_tail(struct net *net, const 
struct sock *sk,
        }
 #endif
        if (ipv6_addr_v4mapped(&fl6->saddr) &&
-           !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr)))
-               return -EAFNOSUPPORT;
+           !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) {
+               err = -EAFNOSUPPORT;
+               goto out_err_release;
+       }
 
        return 0;
 
-- 
2.11.0.483.g087da7b7c-goog